Tweak repo assembly code

... to not exclude templates used by PackageMaker

Author: fingolfin

.github/workflows/test-all.yml

@@ -202,7 +202,9 @@ jobs:
       - name: "Create tarball"
         run: |
           cd $HOME
-          tar --exclude-vcs --exclude=build/obj --exclude=.libs -cf gap.tar.zst gap
+          tar --exclude='*/.git' --exclude='*/.git/*' \
+              --exclude=build/obj --exclude=.libs \
+              -cf gap.tar.zst gap
 
       - name: "Compute suitable artifact basename"
         id: get-artifact-name